I have loaded my own pdf book on my iPad via Google Drive, and opened it in my PDF program as well as in iGigBook. I have created a book and uploaded all the tunes in myiGigBook. I have synced myiGigBook. But, still, it shows in My Books that the pdf book is not on my iPad. What's the problem?

I have loaded my own pdf book on my iPad via Google Drive, and opened it in my PDF program as well as in iGigBook. I have created a book and uploaded all the tunes in myiGigBook. I have synced myiGigBook. But, still, it shows in My Books that the pdf book is not on my iPad. What's the problem?